package com.heima.article.service.impl;

import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.article.mapper.ApArticleConfigMapper;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.mapper.ApArticleMapper;
import com.heima.article.service.ApArticleService;
import com.heima.article.service.ArticleFreemarkerService;
import com.heima.common.constants.ArticleConstants;
import com.heima.common.constants.BehaviorConstants;
import com.heima.common.exception.CustomException;
import com.heima.common.redis.CacheService;
import com.heima.model.article.dtos.ArticleDto;
import com.heima.model.article.dtos.ArticleHomeDto;
import com.heima.model.article.dtos.ArticleInfoDto;
import com.heima.model.article.mess.ArticleVisitStreamMess;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.article.vos.HotArticleVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.utils.thread.ApUserThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.heima.model.article.pojos.ApArticleConfig;

import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Transactional
@Slf4j
public class ApArticleServiceImpl extends ServiceImpl<ApArticleMapper, ApArticle> implements ApArticleService {

    @Autowired
    private ApArticleMapper apArticleMapper;

    @Autowired
    private ApArticleConfigMapper apArticleConfigMapper;

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;

    @Autowired
    private ArticleFreemarkerService articleFreemarkerService;

    @Autowired
    private CacheService cacheService;

    @Override
    public ResponseResult load(Short type, ArticleHomeDto dto) {
        //1.数据校验
        if (dto == null && type == null){
            throw new CustomException(AppHttpCodeEnum.PARAM_INVALID);
        }
        //2.数据处理
        //2.1如果size前端没有传,给个默认值:10  如果前端传了,判断是否过大,过大取限定值:50
        if (dto.getSize() == null || dto.getSize() <= 0){
            dto.setSize(10);
        } else {
            dto.setSize(Math.min(50,dto.getSize()));
        }
        //2.2如果tag没给,设置默认频道"__all__"
        if (StringUtils.isEmpty(dto.getTag())){
            dto.setTag(ArticleConstants.DEFAULT_TAG);
        }
        //2.3如果最大时间和最小时间前端没给,设置为当前系统时间
        if (dto.getMaxBehotTime() == null)dto.setMaxBehotTime(new Date());
        if (dto.getMinBehotTime() == null)dto.setMinBehotTime(new Date());

        //2.4如果loadtype没给,默认加载首页,也就是加载更多
        if (type == null)type = ArticleConstants.LOADTYPE_LOAD_MORE;

        //3.业务操作
        List<ApArticle> list = apArticleMapper.loadArticleList(dto,type);

        //4.返回结果
        return ResponseResult.okResult(list);
    }


    /**
     * 保存App相关文章
     * @param dto
     * @return
     */
    @Override
    public ResponseResult saveArticle(ArticleDto dto) {
        //1.检查参数
        if(dto == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

//        try {
//            Thread.sleep(30000000);
//        } catch (InterruptedException e) {
//            e.printStackTrace();
//        }

        ApArticle apArticle = new ApArticle();
        BeanUtils.copyProperties(dto,apArticle);

        //2.判断是否存在id
        if(dto.getId() == null){
            //2.1 不存在id  保存  文章  文章配置  文章内容

            //保存文章
            save(apArticle);

            //保存配置
            ApArticleConfig apArticleConfig = new ApArticleConfig(apArticle.getId());
            apArticleConfigMapper.insert(apArticleConfig);

            //保存 文章内容
            ApArticleContent apArticleContent = new ApArticleContent();
            apArticleContent.setArticleId(apArticle.getId());
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.insert(apArticleContent);

        }else {
            //2.2 存在id   修改  文章  文章内容

            //修改  文章
            updateById(apArticle);

            //修改文章内容
            ApArticleContent apArticleContent = apArticleContentMapper
                    .selectOne(Wrappers.<ApArticleContent>lambdaQuery()
                            .eq(ApArticleContent::getArticleId, dto.getId()));
            apArticleContent.setContent(dto.getContent());
            apArticleContentMapper.updateById(apArticleContent);
        }

        //生成文章详情页  -- 异步调用
        articleFreemarkerService.buildArticleToMinIO(apArticle,dto.getContent());

        //3.结果返回  文章的id
        return ResponseResult.okResult(apArticle.getId());
    }

    /**
     * 加载首页
     * @param dto
     * @param type
     * @return
     */
    @Override
    public ResponseResult loadFirstPage(ArticleHomeDto dto, Short type) {
        //首页：优先推荐缓存中的热点文章数据
        //如果缓存中没有，那再去查数据库
        String articleJson = cacheService.get(ArticleConstants.HOT_ARTICLE_FIRST_PAGE + dto.getTag());
        if (StringUtils.isNotEmpty(articleJson)){
            List<HotArticleVo> list = JSON.parseObject(articleJson, List.class);
            return ResponseResult.okResult(list);
        }else {
            return load(type,dto);
        }
    }

    /**
     * 加载文章详情 数据回显
     * @param dto
     * @return
     */
    @Override
    public ResponseResult loadArticleBehavior(ArticleInfoDto dto) {

        //0.检查参数
        if (dto == null || dto.getArticleId() == null || dto.getAuthorId() == null) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //{ "isfollow": true, "islike": true,"isunlike": false,"iscollection": true }
        boolean isfollow = false, islike = false, isunlike = false, iscollection = false;

        Integer userId = ApUserThreadLocalUtil.get();
        if(userId != null){
            //喜欢行为
            String likeBehaviorJson = (String) cacheService.hGet(BehaviorConstants.LIKE_BEHAVIOR
                    + dto.getArticleId().toString(), userId.toString());
            if(StringUtils.isNotBlank(likeBehaviorJson)){
                islike = true;
            }
            //不喜欢的行为
            String unLikeBehaviorJson = (String) cacheService.hGet(BehaviorConstants.UN_LIKE_BEHAVIOR
                    + dto.getArticleId().toString(), userId.toString());
            if(StringUtils.isNotBlank(unLikeBehaviorJson)){
                isunlike = true;
            }
            //是否收藏
            String collctionJson = (String) cacheService.hGet(BehaviorConstants.COLLECTION_BEHAVIOR
                    + userId,dto.getArticleId().toString());
            if(StringUtils.isNotBlank(collctionJson)){
                iscollection = true;
            }

            //是否关注
            Double score = cacheService.zScore(BehaviorConstants.APUSER_FOLLOW_RELATION
                    + userId, dto.getAuthorId().toString());
            System.out.println(score);
            if(score != null){
                isfollow = true;
            }

        }

        Map<String, Object> resultMap = new HashMap<>();
        resultMap.put("isfollow", isfollow);
        resultMap.put("islike", islike);
        resultMap.put("isunlike", isunlike);
        resultMap.put("iscollection", iscollection);

        return ResponseResult.okResult(resultMap);
    }

    /**
     * 更新热点文章分值及修改文章行为数据
     * @param mess
     */
    @Override
    public void updateScore(ArticleVisitStreamMess mess) {
        //0. 先拿到更新前的行为分值
        ApArticle apArticle = apArticleMapper.selectById(mess.getArticleId());
        Integer oldScore = computeScore(apArticle);

        //1. 更新数据库中文章的行为数据
        ApArticle article = updateArticle(mess);

        //2. 对当前文章重新算分
        apArticle.setCollection(mess.getCollect());
        apArticle.setComment(mess.getComment());
        apArticle.setLikes(mess.getLike());
        apArticle.setViews(mess.getView());
        Integer scoreToday = computeScore(apArticle);
        scoreToday *= 3;        //当日热度权重整体 * 3

        Integer score = oldScore + scoreToday;

        //3. 更新对应频道的热点文章
        replaceDataToRedis(article, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + apArticle.getChannelId());

        //4. 更新推荐频道的热点文章
        replaceDataToRedis(article, score, ArticleConstants.HOT_ARTICLE_FIRST_PAGE + ArticleConstants.DEFAULT_TAG);
    }

    /**
     * 替换数据并且存入到redis
     * @param apArticle
     * @param score
     * @param channelId
     */
    private void replaceDataToRedis(ApArticle apArticle, Integer score, String channelId) {
        String articleListStr = cacheService.get(channelId);
        if (StringUtils.isNotBlank(articleListStr)) {
            List<HotArticleVo> hotArticleVoList = JSON.parseArray(articleListStr, HotArticleVo.class);

            boolean flag = true;

            //如果缓存中存在该文章，只更新分值
            for (HotArticleVo hotArticleVo : hotArticleVoList) {
                if (hotArticleVo.getId().equals(apArticle.getId())) {
                    hotArticleVo.setScore(score);
                    flag = false;
                    break;
                }
            }

            //如果缓存中不存在，查询缓存中分值最小的一条数据，进行分值的比较，如果当前文章的分值大于缓存中的数据，就替换
            if (flag) {
                if (hotArticleVoList.size() >= 30) {
                    hotArticleVoList = hotArticleVoList.stream()
                            .sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
                    HotArticleVo lastHot = hotArticleVoList.get(hotArticleVoList.size() - 1);
                    if (lastHot.getScore() < score) {
                        hotArticleVoList.remove(lastHot);
                        HotArticleVo hot = new HotArticleVo();
                        BeanUtils.copyProperties(apArticle, hot);
                        hot.setScore(score);
                        hotArticleVoList.add(hot);
                    }
                } else {
                    HotArticleVo hot = new HotArticleVo();
                    BeanUtils.copyProperties(apArticle, hot);
                    hot.setScore(score);
                    hotArticleVoList.add(hot);
                }
            }
            //缓存到redis
            hotArticleVoList = hotArticleVoList
                    .stream().sorted(Comparator.comparing(HotArticleVo::getScore).reversed()).collect(Collectors.toList());
            cacheService.set(channelId, JSON.toJSONString(hotArticleVoList));
        }
    }

    /**
     * 更新文章行为数量
     * @param mess
     */
    private ApArticle updateArticle(ArticleVisitStreamMess mess) {
        ApArticle apArticle = getById(mess.getArticleId());
        apArticle.setCollection(apArticle.getCollection() == null ? mess.getCollect() : apArticle.getCollection() + mess.getCollect());
        apArticle.setComment(apArticle.getComment() == null ? mess.getComment() : apArticle.getComment() + mess.getComment());
        apArticle.setLikes(apArticle.getLikes() == null ? mess.getLike() : apArticle.getLikes() + mess.getLike());
        apArticle.setViews(apArticle.getViews() == null ? mess.getView() : apArticle.getViews() + mess.getView());
        updateById(apArticle);
        return apArticle;
    }

    /**
     * 计算文章的具体分值
     * @param apArticle
     * @return
     */
    private Integer computeScore(ApArticle apArticle) {
        Integer score = 0;
        if(apArticle.getLikes() != null){
            score += apArticle.getLikes() * ArticleConstants.HOT_ARTICLE_LIKE_WEIGHT;
        }
        if(apArticle.getViews() != null){
            score += apArticle.getViews();
        }
        if(apArticle.getComment() != null){
            score += apArticle.getComment() * ArticleConstants.HOT_ARTICLE_COMMENT_WEIGHT;
        }
        if(apArticle.getCollection() != null){
            score += apArticle.getCollection() * ArticleConstants.HOT_ARTICLE_COLLECTION_WEIGHT;
        }

        return score;
    }
}
